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Note H - Computations of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net income $ 3,992 $ 7,039 $ 6,927 $ 12,408
Basic weighted average common shares outstanding (in shares) 6,551 7,431 6,836 7,428
Dilutive effect of common stock equivalents (in shares) 21 43 22 43
Diluted weighted average common shares outstanding (in shares) 6,572 7,474 6,858 7,471
Basic earnings per share (in dollars per share) $ 0.61 $ 0.95 $ 1.01 $ 1.67
Diluted earnings per share (in dollars per share) $ 0.61 $ 0.94 $ 1.01 $ 1.66